Stability design of structures with semi-rigid connections

Self Cite

For the purpose of determination of technical safety, and additional safety necessitated by public an social reasons, this paper considers methods of relations, probability and combined relation and probability. Also considered are functional failure and collapse failure, as well as the concept of designed service life of the structure. The ultimate safety degree is composed o the part for security regarding the technical and social consequences of collapse. The safety determination method, in technical terms too, strives to avoid the damage which would exceed the bearing capacity of the structure. The relation methods apply the safety degree which was obtained in cases when the similar structures of various dimensions were built, so it is necessary to determine the required dimensions to avoid the structural failure. The Probability method is widely applied using statistical data in the load and strength analysis. The combination of relation and probability methods provides the minimum safety degree as a reliable factor

Section: Methods Of Relationsmentioning

confidence: 99%

Section: Technical Methodsmentioning

confidence: 99%

Structural safety determination methods

Zdravkovic¹,

Igić²,

Stojić³

2012

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“…Substituting expression (11) into Eq. (8), deformed axis of a beam element with semirigid and eccentric connections may be expressed as…”

Section: Effect Of Semi-rigid and Eccentric Connections Upon Bending mentioning

confidence: 99%

“…As opposed to the present analysis, [8] is addressing the effects of semi-rigid and eccentric connections of framework structures in the modal and particularly spectral earthquake analysis. Besides applications in dynamic and earthquake analysis, the effects of semi-rigid connections are considered also in stability analysis, see [11], and in foundation design and soil-structure interaction based on the Winkler's model, see [12]. Prefabricated structures should also be treated as structures with semi-rigid connections, see, for example, [13].…”

Section: Introductionmentioning

confidence: 99%

Dynamic properties and time response of frameworks with semi-rigid and eccentric connections

Gopčević¹,

Brčić

Žugić

2011

The paper is considering effects of the semi-rigid and eccentric joint connections of framework structures upon its dynamic properties and the time response due to an earthquake action. The corresponding numerical method representing the linear structural behavior is developed. Semi-rigid connections at beam ends are presented by the rotational springs at beam's ends, with linear moment-rotation relationship. Eccentricity of joint connections is presented by the corresponding short infinitely rigid links at beam's ends. The effect of semi-rigid and eccentric connections is introduced in the numerical model by the corresponding corrective matrix. The corrective matrix is applied upon the conventional stiffness matrix of the beam element with usual rigid and centric connections. As important dynamic properties, the change of the natural circular frequencies and the natural modes, due to variation of joint rigidity and eccentricity of beam-to-column connections, is analyzed. In the time response structural analysis, considering displacements only, dynamic loading due to an earthquake defined by a given accelerogram is considered. The solution of the differential equations of motion is obtained by direct numerical step-by-step integration using the α method (Hilber-Hughes- Taylor). In order to perform the numerical analysis, all considered numerical models and methods are implemented into the corresponding computer code, called ELAN, which is then used for the parametric analyses presented in the paper

“…The issue is not only technical in nature, but also the socio-economic and there is no solution for it. The ultimate degree of safety comprises protection against: a) technical and b) social effects of collapse [4].…”

Section: Introductionmentioning

confidence: 99%

Vulnerability of structures from the aspect of seismic safety and risk in architectonic designing

Zdravkovic¹,

Mitković²,

Turnić³

2013

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It is natural the people should be most interested in the behavior of buildings during earthquakes, as they spend the most of their time in them. The times when the buildings were designed and constructed for unknown customers have passed. Apart from the static stability, which must not be endangered, care must be taken of functional and esthetic features. The buildings are long-lasting and expensive human property, more so in the seismic areas, so by their quality they must guarantee safety to their users. Regarding high seismicity and frequency of earthquakes on the territory of our country, safety of social resources and human lives must be harmonized with the development degree and future needs of the society and the users. Through seismic safety and reduction of risks, we protect ourselves from collapse and damage of the structures, from injuries and human casualties, and from direct and indirect, economic and functional, social and other damage. For these reasons building in seismically active areas is a complex task. Complete protection from the earthquake action is not possible, and for this reason the level of seismic risk represents an acceptable vulnerability for the corresponding period and probability of excitation. Structures are protected from collapse and seismic damage if the appropriate regulations are applied. Seismic division in micro-regions represents a good approach to defining an uniform criterion of protection of structures and protection of equipment in them